!<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <title>Page Title</title>
  <meta name="viewport" content="width=device-width, initial-scale=1">
 
</head>
<body>
   <div id="app">
   
   </div>

   
   <!-- 下面一行引用必须放到这里，不能放到head里，否则不起作用 -->
   <script src="/bundle.js"></script>
</body>
</html>